watch #documentaries on http://docur.co [astrobiology] The famous Drake Equation put forward by Frank Drake back in the 1961. See also "Rare Earth equation" (a somewhat less trusted equation, but interesting nonetheless). ~Al. A.

Drake Equation - Considerable disagreement on the values of most of these parameters exists. Drake states that given the uncertainties, there are probably between 1000 and 100,000,000 civilizations in the galaxy. {Wikipedia}

Play with our interactive graphic to work out how many intelligent civilizations there could be in our universe.Are we alone? It is a question that has occupied mankind for centuries... | P O C: Présentation Originale des Connaissances